Combined lifting-jack and propelling means therefor.



PATENTED DEC. 29, 1903.

C. E. ROTH. COMBINED LIFTING JACK AND PROPELLING MEANS THEREFOR.

APPLIUATION FILED MAN 20, 1902. RENEWED AUG. 10, 1903.

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No. 748,311. 1"ATENTEDDE G. 29-, 1903.

i .0. B. ROTH. COMBINED LIFTING JAGKYAND PROPELLING MEANS THEREFOR.

AIFPLIUATION FILED IAYQO, 1902. RENEWED AUG, 10. 1903.

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Patented December 29, 1903.

UNITED STATES 1 PATENT OFFICE.

, ful Improvements in a Combined Lifting-Jack and Propelling Means Therefor; and I do hereby declare the following to be a full, clear,

' has particular relation to a jack and its sup-- port capable of being propelled along a run- I CHARLES E. ROTH, OF RICHMOND, VIRGINIA.

COMBINED LlFTlNG-JACK AND jPROPELLING MEANS THEREFOR.

SPECIFICATION forming part of Letters Patent No. 748,311, dated December 29, 1903.

Application filed May 20, 1902. Renewed August 10, 1903. Serial No. 169,003. (No model.)

mond, in the county of Henrioo and State of Virginia, have invented certain new and useand exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to lifting-jacks, and

way or track. Where it is the intention to not only raise a heavy body, but to move it bodily to a point away from where it was taken, the general practice has been to employ a crane or its equivalent. It is well known, however, that the mechanism involved in the lifting- ;jack is superior as a means for raising a heavy body, inasmuch as it is more direct and positive, dispensing with the use of ropes, blocks, &c. Lifting-jacks, however, when in use have not, so far as I am aware, been capable of being moved to a difierent point, as that has necessitated the moving of both the load and jack.

The object of my invention is therefore to provide a structure of lifting-jack and support which will not only elevate an extremely heavy weight or load with a minimum amount of power, but which will also permit of the jack and load being moved bodily along a predetermined path with comparative ease.

A further object is to provide a structure which is durable in construction, simple and efficient in operation, and which can be made at moderate cost.

To these and other ends myinvention consists in the improved construction and combination of parts hereinafter fully described, illustrated in the accompanying drawings, and particularly pointed out in the appended claims.

In the drawings, Figure 1 is a view in elevation of the lifting-jack and the mechanism combined therewith embodied in my invention. Fig. 2 is a vertical sectional view of the same. Fig. 3 is a detail showing the and tracks.

7 I I u I manner in which the worm-shaft 1s adJustably mounted to permit of its being placed in engagement with either the elevating-gear or the gear for moving the jack along the track. Fig. 4 is a detail view of the mount for the jack. Fig. 5 is a view in elevation, taken at right angles to Fig. 1.

Similar reference characters indicate simi lar parts.

1 designates the jack-body, having an annular flange 2 at its bottom and a projecting portion 3 at its top.

4; designates a vertical opening extending from the top.

The upper surface of the body 1 is provided with depressions or, if desired, an annular runway for the reception of balls 5, which in turn support the worm-gear 6, which carries the jack-screw 7, the latter having a screw-threaded connection with the gear 6, but free to move vertically in the opening 4 in the body. The jack-body is further provided with a guard 8, which tends to prevent the gear 6 from being moved off of the body portion and also prevents its being moved out of the path of the worm-shaft 9. The screw 7 is of any desired character and having a head 10, preferably swiveled.

The worm-shaft 9 is mounted in lugs 11, formed on the body portion, the mounting being preferably as shown in Fig. 3, consisting'of a block 12, mounted in an elongated slot in the lug 11, said block being positioned by the set-screws 13, thereby permitting of the shaft being moved into and out of engagement with the gear 6. A handle 14 permits of a rotation of the worm.

15 designates the mount for the jack (best shown in Fig. 4) and having a U shape in plan view. Said mount is provided with a groove 16 for the reception of the flange 2. Said mount is also provided with depressions 17, forming a runway for the balls 18, which are seated in similar depressions 19, formed in the upper surface of the tracks 20, thereby forming a ball-bearing between the mount The tracks 20 are preferably formed as shown, having upwardly-projecting portions 21 for positioning the mountand having a rack 22 on the inner surface below the plane of the mount.

23 designates a vertically-extending shaft passing through the lower portion of the body and the projecting portion 3, said shaft having at its upper end a worm-gear 24, adapted for operative engagement with the worm,and having at its lower end a gear 25, adapted to engage with the rack of one of the tracks.

In operation the tracks are laid below the body to be moved and extending in the direction in which the movement is to take place and the jack placed in position. The worm-shaft is moved into engagement with the gear 6 (disconnecting it from the gear 24:) and the handle operated. This serves to raise the load. When it has been raised the necessary distance, the shaft 9 is moved to engage with the gear 24, whereupon an operation of the handle serves to move the jack along the track.

It will be obvious that the disengagement of the worm from the gear 6 may be had without any liability of the load being lowered, as the pitch of the screw-threads is not sufficient to permit the weight of the load to begin a movement tending to operate the screw 7.

Having thus described my invention, What I claim as new is 1. The combination with a lifting-jack having an elevating-screw and a runway or track for the jack,mechanism for operating said elevating-screw, mechanism for propelling the jack along the track, and means for interchangeably shifting part of the lifting mechanism into and out of connection with the propelling mechanism, substantially as described.

2. In combination, a lifting-jack having an elevating screw; means for moving said screw; a runway or track for said jack; and adjustable, interchangeable operative connections between said track and the means for moving said screw, whereby the jack may be moved bodily along the track.

3. A combined lifting-jack and propelling means therefor, comprising a jack-bod y; elevating means connected therewith; upright gear connected thereto; an operating-shaft passing through projections in said jackbody; and means adapted to engage gearwheels on said upright shaft, whereby the lifting-jack and its lead is shifted to any desired location.

4. A lifting-jack comprising a jack-body; an elevating-screw adapted to said body; a worm-gear located above and supported by said jack-body; a worm-shaft adapted to engage said gear; and an upright shaft connected to said jack-body and provided with a gear-wheel at or near each end thereof, and a rack engaging with the gear-wheel at the lower end of the shaft.

In testimony whereof I affix my signature in presence of two witnesses.

CHARLES E. ROTH.

Witnesses:

MAY M. PLYER, E. P. BUNYEA. 

